[Aavso-photometry] ASAS 023322-1047.0 : early superhumps with a period of 0.0547 d

[Tonny Vanmunster]

Dear colleagues,

I have received additional CCD observations of ASAS 023322-1047.0 from Tom
Krajci, David Boyd, Berto Monard and Mark Armstrong. Our dataset now
comprises a total of 1445 observations, covering 2.1 days of the initial
phase of the outburst.

A period analysis using the ANOVA method (Peranso) reveals a dominant signal
at 0.0547 +/- 0.0003 d, that is clearly showing the signature of
double-peaked "early superhumps". I have created a phase diagram, folding
all observations over the above mentioned period, and I then averaged the
data per 5 observations. The resulting phase diagram is very nicely
revealing the early superhump. Amazing to see how much detail we can derive
by joining the observation sets of individual observers, taking into account
that each session was relatively short.

The ASAS 023322-1047.0 reduced light curve with all observations, as well as
the ANOVA period window and the averaged phase diagram are all presented on
my website (www.cbabelgium.com). 

The object is now gradually fading, which is quite common in this stage of
the outburst. If ASAS 023322-1047.0 is an UGWZ-type dwarf nova (which I
believe it is), then we may expect to see the evolution of normal superhumps
within a few days. 

Keep on observing !

Best regards,
Tonny

Tonny Vanmunster
CBA Belgium Observatory
http://www.cbabelgium.com 
 
PERANSO : The Light Curve and Period Analysis Software
http://www.peranso.com